Sheep-shear blade



May 15, 192s. A 1,669,420

M. W. MCARDLE SHEEP SHEAR BLADE Filed Jan. 51. 1927 APatented May 15,1928.

MICHAEL w. argentina,

or CHICAGO, ILLINOIS.

" 'SHEEP-sirena BLADE.

`Application filed Januaryl, 1.927.7 Serial 1S1'o.-164,"?06.`

The purpose of thisi'nvention is` to pro-4 vide an improved construction`of a cutting blade for a sheep shear andtheilike. tools, r

adapted :tor rendering the blade :reversible 4for utilizingthe shear;edges ofthe teeth at both surfaces of the blade andl also-inthepreferred form for utilizing' shear teeth formed at both longitudinaledges of the blade. y

In the drawings: i

Figure l is a plan view of a cutter blade embodying this invention inone of its forms.

Figure 2 is a section at the line, 2-2, on Figure 1. f l

Figure 2y isa section at the same line, showing one vpiece formation.

Figure 3 is a plan view of a modilied and in some respects preferredform of the blade embodying the invention.

Figure 4: is an end edge elevation oi, the blade shown in Figure 3.

Figure 5 is a section atthe line, 5-5, on Figure 3.

Inv both the forms shown in the drawings A represents the vibratingcutter of a sheep shear and the like tool, provided with means for itsengagement by the actuating lever o't the tool for vibrating "it, saidmeans consisting in the apertures, a, for engagement of the cooperatingprojections on the vibra tory lever of well known construction (notshown). The characteristic of the invention `consists in the form of thecutting edges of the blade which is produced by recessing said edgesover their entire operating length `between the opposite upper and lowersur* faces of the blade for forming acute angled cutting corners oftheblade. 4The recesses in the edge vof the blade are indicated at 10 atthe several edges shown inthe drawings. Preferably the recess issymmetrical with respect to the two opposite surfaces of the bladebetween which it is formed, as seen in the drawings, and preferablalsosaid recess is angular as shown in the rawings.

The advantage and purpose of this feature of construction will berecognized as being the adaptation of the blade to be used either sideup on the comb or co-operating shear member ot the toolv forperforming'ts shearing function byv means of either `corner oftheshearing edge, both edges being alike in respect to their capacityfor shearing, and the cutting teeth being formed as to the slope oftheir converging edges for cosope'rating similarly and equally with theteeti of the combler fixed cutter ofthe tool; `so that the blade maybeground in theusual manner alikefupon the two faces and being originallyAground' for-sharpening `the ycutting corners upon both ftaces`,-the toolmay be continued in use twiceas long without interrupting for fregrinding ras itit could not beused either sideup, astlie'gconstructiondescribedrenders possible.l v

The blade as lthus far described may be formed as to the recessed edgesby milling and grinding the edges with properly formed milling andgrinding tools, from a single piece of metal plate of suitable thickness'for receiving the grooves or recesses in its edges;sbut the preferablemode of construction best adaptedfor economical.y and l accurateproduction consists in Vmaking the blade of two plates or laminasperfectly matched at their meeting faces and as to outline, each platebeing beveled at the side of the meeting face before the plates aresecured together, the two bevels co-operating to form the recess whenthe Aplates are thus' matched and secured tace to face. The desirablemethod of securing the plates t0- gether is by electric welding, as maybe understood from the drawings not showing riveting kor other visiblemeans of secure- 2. vibrating cutter for sheep shear andy the like,consistlng of' a metal plate of uniform thickness'throughout, having.its cut-` ter teeth distributed symmetrically about a fore-andaftmiddle line, whereby it is adapted to be reversed longitudinally tobring either of said opposite surfaces into (so-operation with the othermember of they shear, and having the ycutting edges of the teethrecessed throughoutV their operating length between said two oppositefaces.

susy

3. A vibrating cutter blade for sheep shear and the like, Consistinplate of uniform thickness, w iereby its opposite surfaces are vinparallel `planes,.said blade having teeth projecting oppositely of ametal j CFI 2 l f' l 1,669,420

from its opposite longitudinal'edges and disk tributed symmetricallyabout a fore-and-aft middle line and also about a longitudinal middleline, whereby the blade is2 adapted to be reversed both end-for-end andsurfacefor-surface, the teeth upon both longitudinal;

edges being recessed between the opposite surfaces over their entireoperatinglength to form acute angled cutting corners at both seidsurfaces.

4. A vibrating cutter blade for e' sheep shear and the like consistingof e metal; plete fof uniform thickness throughout` whereby the oppositefaces ere in parallel planes, hasL ing teeth projecting froml alongitudinal edge recessed between said opposite parallel fecesthroughout the operating length oi the shearing edges of said teeth,-`saidjreeesses being symmetriealfwith respect 'to said opposite faces.

5A vibrating cutter blade for a sheep shear and the like, consisting ofa metal plantev odi uniform thickness throughout, whereby t-he oppositefaces are in parallel lanes, teethy projecting from a MICHAEL. W.MCARDLE.,

